linux-kernel - Re: [PATCH 1/2] dt-bindings: hwmon: tmp102: Add TMP110 and TMP113 devices

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Message-ID: <176c91e9-aba6-4b4b-893f-99e5ef9e4b8b@roeck-us.net>
Date: Fri, 23 Jan 2026 07:05:40 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Flaviu Nistor <flaviu.nistor@...il.com>, Rob Herring <robh@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: Jean Delvare <jdelvare@...e.com>, Krzysztof Kozlowski
 <krzk+dt@...nel.org>, linux-hwmon@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: hwmon: tmp102: Add TMP110 and TMP113
 devices

On 1/23/26 04:57, Flaviu Nistor wrote:
> On Mon, Sep 29, 2025 at 08:07:43PM +0300, Flaviu Nistor wrote:
>> On Mon, Sep 24, 2025 at 19:12:26 +0100, Conor Dooley wrote:
>>> On Wed, Sep 24, 2025 at 08:55:39AM -0700, Guenter Roeck wrote:
>>>> On 9/15/25 10:18, Conor Dooley wrote:
>>>>> On Mon, Sep 15, 2025 at 08:08:18PM +0300, Flaviu Nistor wrote:
>>>>>> Add a compatible string for TMP110 and TMP113 devices.
>>>>>>
>>>>>> Signed-off-by: Flaviu Nistor <flaviu.nistor@...il.com>
>>>>>> ---
>>>>>>    Documentation/devicetree/bindings/hwmon/ti,tmp102.yaml | 2 ++
>>>>>>    1 file changed, 2 insertions(+)
>>>>>>
>>>>>> diff --git a/Documentation/devicetree/bindings/hwmon/ti,tmp102.yaml b/Documentation/devicetree/bindings/hwmon/ti,tmp102.yaml
>>>>>> index 96b2e4969f78..840b5306a8cf 100644
>>>>>> --- a/Documentation/devicetree/bindings/hwmon/ti,tmp102.yaml
>>>>>> +++ b/Documentation/devicetree/bindings/hwmon/ti,tmp102.yaml
>>>>>> @@ -13,6 +13,8 @@ properties:
>>>>>>      compatible:
>>>>>>        enum:
>>>>>>          - ti,tmp102
>>>>>> +      - ti,tmp110
>>>>>> +      - ti,tmp113
>>>>>
>>>>> The driver has no match data and no compatible based decisions added in
>>>>> your patch. Why is a fallback to tmp102 not suitable?
>>>>>
>>>>
>>>> That should work for tmp110. However, tmp113 does have additional registers, and it
>>>> might be desirable to report the content of those using debugfs. Fallback for that chip
>>>> would work for now, but that might have to change later if support for the additional
>>>> registers is added to the driver.
>>>
>>> In that case, only the driver would need to change not the binding.
>>> That's fine though, of course.
>>>
>>
>> I am a little confused and I would appreciate some advice if I should leave
>> the series as it is or send a v2 only for documentation and Kconfig updates,
>> droping the binding update?
>>
>>>>
>>>> Guenter
>>>>
>>>>>>      interrupts:
>>>>>>        maxItems: 1
>>>>>> -- 
>>>>>> 2.43.0
>>>>>>
>>>>
> 
> After some time (probably to much) I went through the patch again and
> based on Rob Herring response:
> https://lore.kernel.org/all/20250922162004.GA199858-robh@kernel.org/
> and a similar example for sensirion sh20, sh21 and sh25 sensors,
> where individual compatible string were added in the binding and the
> driver even if there is no match data:
> https://lore.kernel.org/all/20250908-sht2x-v4-3-bc15f68af7de@gmail.com/
> https://lore.kernel.org/all/20250908-sht2x-v4-4-bc15f68af7de@gmail.com/
> I think that the patch can stay as it is for the binding, so different
> compatible string can be use in the device tree in order for the real
> hardware to be describe.
> 

We'll need an Ack for the devicetree changes from a devicetree maintainer.

Guenter